scholarly journals Study the effect of Welding Current on the microstructure and strength of dissimilar weld joint AISI 303/AISI 1008

2021 ◽  
Vol 14 (1) ◽  
pp. 67-75
Author(s):  
Firas Hameed
Keyword(s):  
Mechanical Properties ◽  
Low Carbon Steel ◽  
Welding Current ◽  
Optical Microscope ◽  
Welding Parameters ◽  
Welding Time ◽  
Low Carbon ◽  
Dissimilar Weld ◽  
Steel Aisi ◽  
Joint Quality

The welding of metals is one of the most important processes that require high control for obtaining a good quality of weldments. The joining of dissimilar metals is a more complex operation compared to the joining of similar metals due to the differences in physical metallurgical and mechanical properties. In this article, austenitic stainless steel AISI 303 stud was welded to low carbon steel AISI 1008 plate using arc stud welding (ASW) process. An experimental procedure was applied to estimate the effect of welding parameters namely welding current and welding time on the microstructure and mechanical properties of the joint. The optical microscope V83MC50 was used to show microstructure properties while both the micro-Vickers Hardness and tensile test were adopted to evaluate the mechanical properties. The results revealed that the presence of carbides at the fusion zone FZ towards AISI 303 leads to the maximum value of hardness (501) HV. The best welding parameters were 600 AMP 0.25 second at which joint strength of 515 MPa was recorded. Welding time was the most important parameter in the ASW process followed by welding current, proper selection of welding time, and current welding produces good joint quality

scholarly journals EFFECTS OF WELDING CURRENT ON THE SHAPE AND MICROSTRUCTURE FORMATION OF THIN-WALLED LOW-CARBON PARTS BUILT BY WIRE ARC ADDITIVE MANUFACTURING

2020 ◽  
Vol 58 (4) ◽  
pp. 461
Author(s):  
Van Thao Le ◽  
Quang Huy Hoang ◽  
Van Chau Tran ◽  
Dinh Si Mai ◽  
Duc Manh Dinh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Welding Current ◽  
Welding Parameters ◽  
Low Carbon ◽  
Microstructure Formation ◽  
Thin Walled ◽  
Wire Arc Additive Manufacturing

Wire arc additive manufacturing (WAAM) is nowadays gaining much attention from both the academic and industrial sectors for the manufacture of medium and large dimension metal parts because of its high deposition rate and low costs of equipment investment. In the literature, WAAM has been extensively investigated in terms of the shape and dimension accuracy of built parts. However, limited research has focused on the effects of welding parameters on the microstructural characteristics of parts manufactured by this process. In this paper, the effects of welding current in the WAAM process on the shape and the microstructure formation of built thin-walled low-carbon steel components were studied. For this purpose, the thin-walled low-carbon steel samples were built layer-by-layer on the substrates by using an industrial gas metal arc welding robot with different levels of welding current. The shape, microstructures and mechanical properties of built samples were then analyzed. The obtained results show that the welding current plays an important role in the shape stability, but does not significantly influence on the microstructure formation of built thin-walled samples. The increase of the welding current only leads to coarser grain size and resulting in decreasing the hardness of built materials in each zone of the built sample. The mechanical properties (hardness and tensile properties) of the WAAM-built thin-walled low-carbon steel parts are also comparable to those of wrought low-carbon steel, and to be adequate with real applications.

An Experimental Study on Effect of T-Joint’s Root Gap on Welding Properties

2017 ◽  
Vol 863 ◽  
pp. 323-327 ◽  
Author(s):  
Yustiasih Purwaningrum ◽  
Panji Lukman Tirta Kusuma ◽  
Dwi Darmawan
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Testing Machine ◽  
Low Carbon Steel ◽  
Physical And Mechanical Properties ◽  
Optical Microscope ◽  
Low Carbon ◽  
Weld Metals ◽  
A Value ◽  
Welding Properties

The aimed of this research is to investigate the effect of T-Joint’s root gap on physical and mechanical properties of weld metal. Low carbon steel were joined in T-joint types using MIG (Metal Inert Gas) with variation of root gap. The root gap used were 0 mm, 3 mm and 6 mm. The physical properties examined with chemical composition, microstructure and corrosion using optical microscope. The mechanical properties were measured with respect to the strength and hardness using Universal testing machine and Vickers Microhardness. The results show that the highest value found in welds with a gap of 3 mm with a value of 163.57 MPa. Hardness value is directly proportional to the tensile strength of the material. The highest value found in welds with root gap of 3 mm, followed by root gap of 6 mm, and 0 mm Hardness values in the welding area is higher than the parent metal and HAZ because the number of Si, Mn and Cu elements in the welding metals are bigger than base metal. Weld with all variation of root gap have a good corrosion resistance because the corrosion rate in welds with various root gap have a value below 0.02 mmpy. Microstructure of weld metals were Accicular ferrite, Widmanstatten ferrite, and grain boundary ferrite, while microstructure of base metal and HAZ were ferrite and perlite.

Investigation on Friction Conditions during a Severe Bending Deformation on a Thick Plate

2016 ◽  
Vol 716 ◽  
pp. 176-183
Author(s):  
Antonello D'Annibale ◽  
Mohamad El Mehtedi ◽  
Antoniomaria Di Ilio ◽  
Filippo Gabrielli ◽  
Lorenzo Panaccio
Keyword(s):  
Mechanical Properties ◽  
Mechanical Model ◽  
Thick Plate ◽  
Low Carbon Steel ◽  
Experimental Tests ◽  
Stress And Strain ◽  
Low Carbon ◽  
Bending Process ◽  
Steel Aisi ◽  
Machining Operations

In this paper, the friction behaviour in a severe bending process of a thick plate was investigated, taking into account both dry and lubricated conditions. Early experimental tests were performed to obtain mechanical properties of the low carbon steel AISI 1006, to be used as input in FE solver. Besides a 3D thermo-mechanical model based on FEM was developed to predict stress and strain distributions and final component dimensions. The second experimental series was composed of a coining process and a forming operation to reach the size of the final part. The analysis and the control of the friction conditions has permitted to obtain a product of higher quality that permitted to avoid all the secondary machining operations previously required.

scholarly journals Optimization of Tensile-Shear Strength in the Dissimilar Joint of Zn-Coated Steel and Low Carbon Steel

2020 ◽  
Vol 3 (3) ◽  
pp. 115-125
Author(s):  
Sukarman Sukarman ◽  
Amri Abdulah ◽  
Jatira Jatira ◽  
Dede Ardi Rajab ◽  
Rohman Rohman ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Steel ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Low Carbon Steel ◽  
Welding Current ◽  
Welding Time ◽  
Tensile Shear Strength ◽  
Low Carbon ◽  
Tensile Shear

The present study features analytical and experimental results of optimizing resistance spot welding performed using a pneumatic force system (PFS). The optimization was performed to join SECC-AF (JIS G 3313) galvanized steel material with SPCC-SD low carbon steel. The SECC-AF is an SPCC-SD (JIS G 3141) sheet plate coated with zinc (Zn) with a thickness of about 2.5 microns. The zinc coating on the metal surface causes its weldability to decrease. This study aims to obtain the highest tensile-shear strength test results from the combination of the specified resistance spot welding parameters. The research method used the Taguchi method using four variables and a combination of experimental levels. The experimental levels are 2-levels for the first parameter and 3-levels for other parameters. The Taguchi optimization experimental results achieved the highest tensile-shear strength at 5049.64 N. It properly worked at 22 squeeze time cycles, 25 kA of welding current, and 0.6-second welding time and 12 holding-time cycles. The S/N ratio analysis found that the welding current had the most significant effect, followed by welding time, squeeze time, and holding time. The delta S/N ratio values were 1.05, 0.67, 0.57 and 0.29, respectively.

Study on Resistance Spot Welding Technology and Properties of TRIP800 High Strength Steel Sheet

2011 ◽  
Vol 391-392 ◽  
pp. 661-665
Author(s):  
Yan Yu ◽  
Feng Xue Wang ◽  
Zai Dao Yang
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
Spot Welding ◽  
Welding Current ◽  
High Strength ◽  
Welding Parameters ◽  
Welding Time ◽  
Test Analysis ◽  
Welding Technology ◽  
Welding Electrode

A series of spot welding technology, joint mechanical properties and microhardness test analysis of TRIP800 high strength steel were researched. Based on these experiments and analysis, effect of spot welding parameters such as welding current, welding time and electrode pressure on joint mechanical properties were explored. The relevant spot welding parameters of TRIP800 high strength steel of spot welding were recommended, such as welding current is7.5~8.0KA, electrode pressure is 450 kgf and welding time is 20cyc. Welding electrode should be to ensure that as much as possible and clean the surface,to avoid welding current and welding time is too high or too long, as well as forging lack of power, to prevent the occurrence of welding defects.

Investigation on Joint Strength of Dissimilar Resistance Spot Welds of Aluminum Alloy and Low Carbon Steel

2011 ◽  
Vol 264-265 ◽  
pp. 384-389 ◽  
Author(s):  
Seyedeh Nooshin Mortazavi ◽  
Pirooz Marashi ◽  
Majid Pouranvari ◽  
Maryam Masoumi
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Carbon Steel ◽  
Failure Mode ◽  
Peak Load ◽  
Low Carbon Steel ◽  
Welding Current ◽  
Low Carbon ◽  
Spot Welds ◽  
Resistance Spot

Resistance spot welding was used to join low carbon steel and A5250 Aluminum alloy sheets. Mechanical properties and failure behavior of the spot welds in terms of peak load, failure energy and failure mode, were evaluated using tensile- shear test. Relationship between welding current and mechanical properties was investigated. It was found that the formation of brittle intermetallic compounds in the weld fusion zone is the key governing factor for mechanical properties of dissimilar Al alloy/low carbon steel resistance spot weld. Increasing welding current, increases both peak load and energy absorption due to increasing overall bond area and transition in failure mode from interfacial to pullout failure mode.

Cold Rolling Effect on Microstructure and Mechanical Properties of Low Carbon Al-Killed Steels

2015 ◽  
Vol 812 ◽  
pp. 315-320
Author(s):  
Enikö Réka Fábián ◽  
Áron Kótai
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Low Carbon Steel ◽  
Optical Microscope ◽  
Low Carbon ◽  
Coiling Temperature ◽  
Steel Sheets ◽  
Hot Rolled ◽  
Ebsd Method ◽  
Scanning Electron

It have been studied the cold rolling effects on the microstructure of samples prepared from Al-killed low carbon steel sheets with high coiling temperatures. The microstructure of the hot rolled steels sheet is formed from ferrite and large carbides when the coiling temperature is high. The cold rolling affects the steel mechanical and electrochemical properties due to microstructural changes. We have studied the microstructure by optical microscope and scanning electron microscope. Low angles grain boundaries and the texture of samples were studied by EBSD method.

scholarly journals Effect of Welding Parameters on the Peak Load and Energy Absorption of Low-Carbon Steel Resistance Spot Welds

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
M. Pouranvari
Keyword(s):  
Carbon Steel ◽  
Peak Load ◽  
Low Carbon Steel ◽  
Welding Current ◽  
Maximum Energy ◽  
Holding Time ◽  
Welding Time ◽  
Low Carbon ◽  
Spot Welds ◽  
Resistance Spot Welds

Effect of process variables (electrode pressure, holding time, welding current, and welding time) on low-carbon steel resistance spot welds performance has been investigated in this paper. Failure mode, peak load, and maximum energy obtained in tensile-shear test have been used to describe spot welds performance. Excessive electrode pressure can reduce both peak load and maximum energy, considerably. Holding time does not significantly affect peak load and maximum energy for investigated material. Increasing welding time and welding current to some extent increases both peak load and maximum energy. However, excessive welding time and welding current not only do not increase weld nugget size and peak load, but also decrease maximum energy.

Study of Welding Dissimilar Metals – Low-carbon Steel AISI 1018 and Austenitic Stainless Steel AISI 304

2020 ◽  
Vol 10 (1) ◽  
pp. 1-5
Author(s):  
Younis K. Khdir ◽  
Salim A. Kako ◽  
Ramadhan H. Gardi
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Carbon Steel ◽  
Austenitic Stainless Steel ◽  
Heat Input ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Aisi 304 ◽  
Steel Aisi ◽  
Stainless Steel Aisi

The aim of this study is to investigate the influence of different heat inputs on mechanical properties and microstructure of dissimilar electrical arc welded austenitic stainless steel AISI 304 and low-carbon steel (CS) joints. The mechanical properties of welded austenitic stainless steel type AISI 304 and low-CS are studied. Five different heat inputs 0.5, 0.9, 1.41, 2, and 2.5 KJ/min were applied to investigate the microstructure of the welded zone and mechanical properties. The results showed that the efficiency of the joints and tensile strength increased with increasing heat inputs, while excess heat input reduces the efficiency. Furthermore, changes in microstructure with excess heat input cause failure at the heat-affected zone.

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